(function(win, doc) {
			//浏览器缩放时
			win.onresize = function() {
				change();
			};
			change();


			function change() {
				var oFs = doc.documentElement.clientWidth / (320 / 20);


				//设置根目录字体大小
				doc.documentElement.style.fontSize = oFs + 'px';
			}
		})(window, document);